package com.common.MultiColumnListView.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.DecelerateInterpolator;
import android.widget.ListAdapter;
import android.widget.RelativeLayout;
import android.widget.Scroller;
import android.widget.TextView;

import com.huewu.pla.lib.MultiColumnListView;
import com.huewu.pla.lib.internal.PLA_AbsListView;
import com.huewu.pla.lib.internal.PLA_AbsListView.OnScrollListener;
import com.starappallcommon.R;
/**
 * 实现一个listview 点击下拉刷新 和 加载更多 
 * 
 * <br>Created 2014-6-6 下午5:26:03
 * @version  
 * @author   cyw    		
 *
 * @see
 */
public class XListView extends MultiColumnListView implements OnScrollListener {

	private float mLastY = -1; // save event y
	private Scroller mScroller; // used for scroll back
//	private OnScrollListener mScrollListener; // user's scroll listener

	// the interface to trigger refresh and load more.
	private IXListViewListener mListViewListener;
	/**显示下拉刷新时间的回调接口*/
	private IGetPullRefreshTimeListener mGetPullRefreshTimeListener;

	// -- header view
	private XListViewHeader mHeaderView;
	// header view content, use it to calculate the Header's height. And hide it
	// when disable pull refresh.
	private RelativeLayout mHeaderViewContent;
	private TextView mHeaderTimeView;
	private int mHeaderViewHeight; // header view's height
	private boolean mEnablePullRefresh = true;
	private boolean mPullRefreshing = false; // is refreashing.

	// -- footer view
	private XListViewFooter mFooterView;
	private boolean mEnablePullLoad;
	private boolean mPullLoading;
	private boolean mIsFooterReady = false;
	
	/**
	 * 是否正在进行上拉下拉
	 */
	private boolean IsDoPullRefreshing = false;
	private boolean IsDoPullLoading = false;
	
	private boolean isDisplayFoot = false;

	// total list items, used to detect is at the bottom of listview.
	private int mTotalItemCount;

	// for mScroller, scroll back from header or footer.
	private int mScrollBack;
	private final static int SCROLLBACK_HEADER = 0;
	private final static int SCROLLBACK_FOOTER = 1;

	private final static int SCROLL_DURATION = 400; // scroll back duration
	// when pull up >= 50px at bottom, trigger load more.
	private final static int PULL_LOAD_MORE_DELTA = 50; 
	private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
													// feature.
	
	/**
	 * 
	 * Creates a new instance of XListView.
	 * <br>Created 2014-6-6 下午5:31:48
	 * @param context 上下文
	 */
	public XListView(Context context) {
		super(context);
		initWithContext(context);
	}

	/**
	 * 
	 * Creates a new instance of XListView.
	 * <br>Created 2014-6-9 下午5:50:14
	 * @param context 上下文
	 * @param attrs 属性集
	 */
	public XListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initWithContext(context);
	}

	/**
	 * 
	 * Creates a new instance of XListView.
	 * <br>Created 2014-6-9 下午5:50:17
	 * @param context 上下文
	 * @param attrs 属性集
	 * @param defStyle style
	 */
	public XListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initWithContext(context);
	}

	/**
	 * 初始化
	 * 
	 * <br>Created 2014-6-9 下午5:50:20
	 * @param context 上下文
	 * @author        :  cyw
	 */
	private void initWithContext(Context context) {
		mScroller = new Scroller(context, new DecelerateInterpolator());
		// XListView need the scroll event, and it will dispatch the event to
		// user's listener (as a proxy).
		super.setOnScrollListener(this);

		// init header view
		mHeaderView = new XListViewHeader(context);
		mHeaderViewContent = (RelativeLayout) mHeaderView.findViewById(R.id.xlistview_header_content);
		mHeaderTimeView = (TextView) mHeaderView.findViewById(R.id.xlistview_header_time);
		addHeaderView(mHeaderView);

		// init footer view
		mFooterView = new XListViewFooter(context);

		// init header height
		mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
			@Override
			public void onGlobalLayout() {
				mHeaderViewHeight = mHeaderViewContent.getHeight();
				getViewTreeObserver().removeGlobalOnLayoutListener(this);
			}
		});
	}

	@Override
	public void setAdapter(ListAdapter adapter) {
		// make sure XListViewFooter is the last footer view, and only add once.
		if (!mIsFooterReady) {
			mIsFooterReady = true;
			addFooterView(mFooterView);
		}
		super.setAdapter(adapter);
	}

	/**
	 * enable or disable pull down refresh feature.
	 * 
	 * @param enable 是否可用
	 */
	public void setPullRefreshEnable(boolean enable) {
		mEnablePullRefresh = enable;
		if (!mEnablePullRefresh) { // disable, hide the content
			mHeaderViewContent.setVisibility(View.INVISIBLE);
		} else {
			mHeaderViewContent.setVisibility(View.VISIBLE);
		}
	}

	/**
	 * enable or disable pull up load more feature.
	 * 
	 * @param enable 是否可用
	 */
	public void setPullLoadEnable(boolean enable) {
		mEnablePullLoad = enable;
		if (!mEnablePullLoad) {
			mFooterView.hide();
//			mFooterView.setOnClickListener(null);
		} else {
			mFooterView.show();
		}
		mPullLoading = false;
		mFooterView.setState(XListViewFooter.STATE_NORMAL);
		// both "pull up" and "click" will invoke load more.
		mFooterView.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				startLoadMore();
			}
		});
	}
	
	/**
	 * stop refresh, reset header view.
	 */
	public void stopRefresh() {
		if (mPullRefreshing) {
			mPullRefreshing = false;
			resetHeaderHeight();
		}
	}

	/**
	 * stop load more, reset footer view.
	 */
	public void stopLoadMore() {
		if (mPullLoading) {
			mPullLoading = false;
			mFooterView.setState(XListViewFooter.STATE_NORMAL);
			if(isDisplayFoot){
				isDisplayFoot = false;
				mFooterView.hide();
				mEnablePullLoad = false;
			}
		}
	}

	/**
	 * set last refresh time
	 * 
	 * @param time 时间
	 */
	public void setRefreshTime(String time) {
		mHeaderTimeView.setText(time);
	}

	/**
	 * 没有具体实现
	 * 
	 * <br>Created 2014-6-9 下午5:51:05
	 * @author        :  cyw
	 */
	private void invokeOnScrolling() {
//		if(mScrollListener != null){
//			if (mScrollListener instanceof OnXScrollListener) {
//				OnXScrollListener l = (OnXScrollListener) mScrollListener;
//				l.onXScrolling(this);
//			}
//		}
	}

	/**
	 * 更新头部高度
	 * 
	 * <br>Created 2014-6-9 下午5:51:23
	 * @param delta 偏移
	 * @author        :  cyw
	 */
	private void updateHeaderHeight(float delta) {
		IsDoPullRefreshing = true;
//		IsDoPullLoading = false;
		mHeaderView.setVisiableHeight((int) delta + mHeaderView.getVisiableHeight());
		if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
			if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
				mHeaderView.setState(XListViewHeader.STATE_READY);
			} else {
				mHeaderView.setState(XListViewHeader.STATE_NORMAL);
			}
		}
		setSelection(0); // scroll to top each time
	}

	/**
	 * reset header view's height.
	 */
	private void resetHeaderHeight() {
		int height = mHeaderView.getVisiableHeight();
		if (height == 0) {// not visible.
			return;
		}
		// refreshing and header isn't shown fully. do nothing.
		if (mPullRefreshing && height <= mHeaderViewHeight) {
			return;
		}
		int finalHeight = 0; // default: scroll back to dismiss header.
		// is refreshing, just scroll back to show all the header.
		if (mPullRefreshing && height > mHeaderViewHeight) {
			finalHeight = mHeaderViewHeight;
		}
		mScrollBack = SCROLLBACK_HEADER;
		mScroller.startScroll(0, height, 0, finalHeight - height, SCROLL_DURATION);
		// trigger computeScroll
		invalidate();
	}

	/**
	 * 更新底部高度
	 * 
	 * <br>Created 2014-6-9 下午5:52:05
	 * @param delta 偏移
	 * @author        :  cyw
	 */
	private void updateFooterHeight(float delta) {
		IsDoPullLoading = true;
//		IsDoPullRefreshing = false;
		int height = mFooterView.getBottomMargin() + (int) delta;
		if (mEnablePullLoad && !mPullLoading) {
			if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
													// more.
				mFooterView.setState(XListViewFooter.STATE_READY);
			} else {
				mFooterView.setState(XListViewFooter.STATE_NORMAL);
			}
		}
		mFooterView.setBottomMargin(height);

		// setSelection(mTotalItemCount - 1); // scroll to bottom
	}

	/**
	 * 重置底部高度
	 * 
	 * <br>Created 2014-6-9 下午5:52:24
	 * @author        :  cyw
	 */
	private void resetFooterHeight() {
		int bottomMargin = mFooterView.getBottomMargin();
		if (bottomMargin > 0) {
			mScrollBack = SCROLLBACK_FOOTER;
			mScroller.startScroll(0, bottomMargin, 0, -bottomMargin, SCROLL_DURATION);
			invalidate();
		}
	}

	/**
	 * 开始加载更多
	 * 
	 * <br>Created 2014-6-9 下午5:52:39
	 * @author        :  cyw
	 */
	private void startLoadMore() {
		mPullLoading = true;
		mFooterView.setState(XListViewFooter.STATE_LOADING);
		if (mListViewListener != null) {
			mListViewListener.onLoadMore();
		}
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		if (mLastY == -1) {
			mLastY = ev.getRawY();
		}

		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mLastY = ev.getRawY();
			break;
		case MotionEvent.ACTION_MOVE:
			// 获取上次刷新时间
			if(mGetPullRefreshTimeListener != null){
				mGetPullRefreshTimeListener.setPullRefreshTime();
			}
			
			final float deltaY = ev.getRawY() - mLastY;
			mLastY = ev.getRawY();
			if (getFirstVisiblePosition() == 0 && (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
				// the first item is showing, header has shown or pull down.
				updateHeaderHeight(deltaY / OFFSET_RADIO);
				invokeOnScrolling();
			} else if (getLastVisiblePosition() == mTotalItemCount - 1 
			        && (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
				// last item, already pulled up or want to pull up.
				if(!isDisplayFoot){
					mFooterView.show();
					isDisplayFoot = true;
					mEnablePullLoad = true;
				}
				updateFooterHeight(-deltaY / OFFSET_RADIO);
			}
			break;
		default:
			mLastY = -1; // reset
//			if(IsDoPullRefreshing && !IsDoPullLoading){
			if(IsDoPullRefreshing){
				if (getFirstVisiblePosition() == 0) {
					// invoke refresh
					if (mEnablePullRefresh && mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
						mPullRefreshing = true;
						mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
						if (mListViewListener != null) {
							mListViewListener.onRefresh();
						}
					}
					resetHeaderHeight();
				} 
				IsDoPullRefreshing = false;
			}
//			else if(!IsDoPullRefreshing && IsDoPullLoading){
			if( IsDoPullLoading){
				if (getLastVisiblePosition() == mTotalItemCount - 1) {
					// invoke load more.
					boolean flag = false;
					if (mEnablePullLoad 
					        && mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA
					        && !mPullLoading) {
						startLoadMore();
					}else{
						flag =true;
					}
					resetFooterHeight();
					if(flag){
						if(isDisplayFoot){
							isDisplayFoot = false;
							mFooterView.hide();
							mEnablePullLoad = false;
						}
						flag = false;
					}
				}
				IsDoPullLoading = false;
			}
			break;
		}
		return super.onTouchEvent(ev);
	}

	@Override
	public void computeScroll() {
		if (mScroller.computeScrollOffset()) {
			if (mScrollBack == SCROLLBACK_HEADER) {
				mHeaderView.setVisiableHeight(mScroller.getCurrY());
			} else {
				mFooterView.setBottomMargin(mScroller.getCurrY());
			}
			postInvalidate();
			invokeOnScrolling();
		}
		super.computeScroll();
	}

//	@Override
//	public void setOnScrollListener(OnScrollListener l) {
//		mScrollListener = l;
//	}
//
//	@Override
//	public void onScrollStateChanged(AbsListView view, int scrollState) {
//		if (mScrollListener != null) {
//			mScrollListener.onScrollStateChanged(view, scrollState);
//		}
//	}
//
//	@Override
//	public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {

//	}

	/**
	 * 设置监听器
	 * 
	 * <br>Created 2014-6-9 下午5:52:55
	 * @param l 监听器
	 * @author        :  cyw
	 */
	public void setXListViewListener(IXListViewListener l) {
		mListViewListener = l;
	}

	/**
	 * you can listen ListView.OnScrollListener or this one. it will invoke
	 * onXScrolling when header/footer scroll back.
	 */
	public interface OnXScrollListener extends OnScrollListener {
	     /**
	      * 滑动回调
	      * 
	      * <br>Created 2014-6-9 下午5:53:13
	      * @param view view
	      * @author        :  cyw
	      */
		 void onXScrolling(View view);
	}

	/**
	 * implements this interface to get refresh/load more event.
	 */
	public interface IXListViewListener {
	    /**
	     * 下拉刷新
	     * 
	     * <br>Created 2014-6-9 下午5:53:37
	     * @author        :  cyw
	     */
		 void onRefresh();

		 /**
		  * 加载更多
		  * 
		  * <br>Created 2014-6-9 下午5:53:43
		  * @author        :  cyw
		  */
		 void onLoadMore();
	}

	@Override
	public void onScrollStateChanged(PLA_AbsListView view, int scrollState) {
//		if (mScrollListener != null) {
//			mScrollListener.onScrollStateChanged(view, scrollState);
//		}
	}
	
	/**
	 * 设置item总数
	 * 
	 * <br>Created 2014-6-9 下午5:54:03
	 * @param totalItemCount item总数
	 * @author        :  cyw
	 */
	public void setTotoalItemCount(int totalItemCount){
		mTotalItemCount = totalItemCount;
	}

	@Override
	public void onScroll(PLA_AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
		// send to user's listener
		mTotalItemCount = totalItemCount;
//		if (mScrollListener != null) {
//			mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
//		}	
	}

	/**
	 * 设置listview 显示的列数，true显示一列，false显示两列
	 * @n<b>函数名称</b>     :setListViewDisplaySingleColumn
	 * @brief
	 * @see
	 * @since    Ver 1.1
	 * @param isDisplaySingle
	 * @<b>作者</b>          :  chenyw
	 * @<b>创建时间</b>      :  2014-4-28下午2:29:18
	 */
//	@Override
//	public void setListViewDisplaySingleColumn(boolean isDisplaySingle) {
//		// TODO Auto-generated method stub
//		super.setListViewDisplaySingleColumn(isDisplaySingle);
//	}
	
	/**
	 *  设置下拉刷新的时间显示接口
	 * ClassName:IGetPullRefreshTimeListener
	 * Function: TODO ADD FUNCTION
	 * Reason:	 TODO ADD REASON
	 * 
	 * @author   chenyw		
	 * @version  XListView
	 * @since    Ver 1.1
	 * @Date	 2014	2014-4-28		下午2:31:22
	 *
	 * @see
	 */
	public interface IGetPullRefreshTimeListener {
	    /**
	     * 设置刷新时间
	     * 
	     * <br>Created 2014-6-9 下午5:54:30
	     * @author        :  cyw
	     */
		 void setPullRefreshTime();
	}
	
	/**
	 *  设置刷新时间显示监听
	 * @n<b>函数名称</b>     :setPullRefreshTimeListener
	 * @brief
	 * @see
	 * @since    Ver 1.1
	 * @param l  监听器
	 * @<b>作者</b>          :  chenyw
	 * @<b>创建时间</b>      :  2014-4-28下午2:36:00
	 */
	public void setPullRefreshTimeListener(IGetPullRefreshTimeListener l) {
		mGetPullRefreshTimeListener = l;
	}
}
